recursion by Moin

# recursion is function calling functioin
# sum of 10 num is sum of 9 + 1
# sum of 9 num is sum of 8 + 1
# sum of 2 num is sum of 1 + 1
# sum of 1 num is sum of 1 + 0

def summing(n):
    answer = 0
    if n<=0:
        return 0
    else:
        summing(n-1)
        for i in range(n+1):
            answer = answer + i
        print(answer)
    
callme = summing(5)